Spark-plug



W. CIRENTZ.

SPARK PLUG.

APPLICATION FILED IuLv'ZI.

WITNESS:

vATTOI'IMJY,

W. CRE'NTZ.

SPARK PLUG. APPLICATION FILED JULY 2l |919.

11,337,959; y Patented Apr.20,1920.

2 SHEETS-SHEET 2.

WI-TNESS: W Z INI/Eg, zz

BY [fam er? z A TTORNE Y.

sentirse pierres Wimmer e. Renna, or Arm-mrs, esonera.

Specification of etters' Patent. Paten-ted ADL 20, 1920,

Application filed July 21, 1919. Serial Ii'o. 312,250.

To alli/. io1nz'zffmag/ Concern:

Be it known that l, Numan C. Reime, a citizen oit the United States, residing at Atlanta in county of Fulton and State of Geol have invented new and useful rnprei' sn Sperk-llugs5 o'l which the folio sijieciicstion.

.an intensifying device with the plug so that an intensifying spa-rk gap can be produced at will. '1' g YWith these and other objects in view the invention will be better'understood from the following detailed description taken in 'j'o1i-- nection with the accompanying drawing, wherein Figure 1 is a` side elevation of the device.

Fig. 2 is ay vertical section view.

Fig. 3 is a top plan view.

Fig. el is a, section View on line 4:--41--.

5 is a section view of the intensifying electrode.

Fig. G is a top plan view thereof.

Fig. 7 is a plan view of the switch arm.

Fig. 8 is o. section view of a slight modified form of my invention.

Figs. 9-10-11-12 are side elevation of other forms of my invention.

Again referring to the drawing illustrating one /lorm in which niy invention may be constructed the numeral 1 designates the bushing within which is rigidly clamped by a cap Q a coreA oi' insulation El. Snitably placed gaskets lare provided to accomplish an air-tight connection between the parts just described. Formed within and extending lengthwise of the bushing 3 isa passage 5, tl e outlet 6 of which is disposed to one side of a inain electrode 7 and an auxiliary electrode ll of the spark plug, A pet-cock fl closes the passage (l, but when open allows gasoleno to pass through the passagl` to the engine cylinder l'or priming the saine. 'lhe intensifying attachment for the plug con- Ssts of a sleeve 11 clamped between the cap 2 and a second cap 12. This sleeve .11 is provided with sight openings 13 through which a view may be had of a sight tube 14 which incloses an end portion of the electrode T and an end portion of an intensifying electrode 15 now to be described. This electrode 153 is threaded in a cap 10 so as to vary the distance of the intensifying spark gap 16. Slidably mounted within the electrode 15 is a contact 1T arranged to be pressed by a spring 18 to a position to bridge the gap 1li and thereby cut out of circuit the intensifying spark gap. T he contact 1T has connected thereto a stein 19 so constructed that a portion thereof may be placed in either of a pair of slots 2O and 21, of dilferent depths so that the contact'may be either spaced from the electrode 7 or allowed to move into engagement therewith.

To complete the invention l provide a. switch 29, which controls the passage of current from the binding post Q8 to the elec-- trode The binding post 2B is carried by a switch arin 2.4 which hasan adjustable' eonnection with the cap 10. i ln Fig. S l have shown a check valve v substituted -for the pet-cock 9 so that it may be automat-ic in its operation.

ln the form of my invention shown in Fig. 9, l have dispensed with switch 22 and have connected directly to the stein of the intensifier, linger piece 2G of insulating inaterial., so that by g asping this finger piece the intensifying contact may be adjusted for the production of an intensifying spark gap or for the omission of the saine. lThe spark plug illustrated in Fig. 10 is identical with that illustrating Fig. 1, with the exception that the switch erm 24 and a portion of the switch 22 are bent at an angle as illustrated at Q7, so that the plug may be readily used in confined spaces, such as occur in airplane engines. In Fig. 11 l have shown a switch in the form of a coil spi-infr S28 one end of which is clamped to the binding post 29 while the remaining end is adapted to be hooked around or disengaged lroin the intensifying electrode by pulling ou the in sulation finger grip 29.

li' found advantageous in practice. the spring pressed intensifying contact 1T can be dispensed with and a manually adjustable thumb screw substituted which is threaded to the plug in a position to close the intensifying spark gap 81 when the screw is adjusted the requiredamount,

'It is of course to be understood that the inventlon may be constructed 1n various other manners and the parts associated in` engines, the combination of a spark plug including an electrode made up ot an mner section, an outer tubular section constiluitingI a switch member and the inner end of which is spaced from the inner section and the out-er end of which is exposed and provided with open slots at angles to each other and of different depths, and an endwise movable contact rod sheathed in the tubular section and having an enlargement at its inner end backed b v a springr inclosed in the tubular section and also having a finger portion at its outer end capable of being placed iu said tubular member of the electrode.

2. A. spark plug for internal combustion engines, comprising an electrode made up of an inner fixed section, an outer tubular fixed section the inner end of which is open and spaced from the inner section and the outer end of which is'exposed and provided with open slots at angles to each other and ot' different depths, and an endwise movable contact rod sheathed in the tubular section and having an enlargement at its inner end backed by a spring inclosedin the tubular section and also having a linger `portion at its outer end capable oi heilig placed in either oi' the slots of the tubular section.

ln testimonyv whereofv I allix my signature. 

